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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Securities available for sale | $ 721,369 | $ 641,382
Total Fair Value |  |
Assets |  |
Securities available for sale | 721,369 | 641,382
State tax credits held for sale | 39,169 | 44,271
Derivative financial instruments | 3,023 | 3,589
Liabilities |  |
Derivative financial instruments | 3,023 | 3,589
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 98,498 | 99,224
Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 26,810 | 34,642
Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 586,136 | 507,516
Recurring basis | Total Fair Value |  |
Assets |  |
Securities available for sale | 721,369 | 641,382
State tax credits held for sale |  | 400
Other Investments | 121 |
Derivative financial instruments | 3,023 | 3,589
Assets, Fair Value Disclosure | 724,513 | 645,371
Liabilities |  |
Derivative financial instruments | 3,023 | 3,589
Total liabilities | 3,023 | 3,589
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Total Fair Value |  |
Assets |  |
Securities available for sale | 98,498 | 99,224
Recurring basis | Obligations of states and political subdivisions | Total Fair Value |  |
Assets |  |
Securities available for sale | 26,810 | 34,642
Recurring basis | Residential mortgage-backed securities | Total Fair Value |  |
Assets |  |
Securities available for sale | 586,136 | 507,516
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Securities available for sale | 0 | 0
State tax credits held for sale |  | 0
Other Investments | 121 |
Derivative financial instruments | 0 | 0
Assets, Fair Value Disclosure | 121 | 0
Liabilities |  |
Derivative financial instruments | 0 | 0
Total liabilities | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Securities available for sale | 721,369 | 641,382
State tax credits held for sale |  | 0
Other Investments | 0 |
Derivative financial instruments | 3,023 | 3,589
Assets, Fair Value Disclosure | 724,392 | 644,971
Liabilities |  |
Derivative financial instruments | 3,023 | 3,589
Total liabilities | 3,023 | 3,589
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 98,498 | 99,224
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 26,810 | 34,642
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 586,136 | 507,516
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available for sale | 0 | 0
State tax credits held for sale |  | 400
Other Investments | 0 |
Derivative financial instruments | 0 | 0
Assets, Fair Value Disclosure | 0 | 400
Liabilities |  |
Derivative financial instruments | 0 | 0
Total liabilities | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | $ 0 | $ 0

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